Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
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Corsair CMSO16GX3M2A1333C9 16gb Kit 2x8gb 1333mhz Ddr3 Cl9 Sodimm Mem for $73.88.
8GB 1333MHZ DDR3 2400MHZ 2666MHZ 3200MHZ 16GB 8GB 4GB DDR4 for Desktop PC 1PCS | eBay